[논문]백팩 착용시 모멘트 팔의 길이가 균형과 보행에 미치는 영향

인태성; 장상훈

doi:10.5762/kais.2019.20.12.418

백팩 착용시 모멘트 팔의 길이가 균형과 보행에 미치는 영향
Effects of the moment arm length of backpacks on balance and walking while carrying a backpack 원문보기

한국산학기술학회논문지 = Journal of the Korea Academia-Industrial cooperation Society, v.20 no.12, 2019년, pp.418 - 424

인태성 (김천대학교 물리치료학과) , 장상훈 (김천대학교 물리치료학과)

초록
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백팩은 한쪽 어깨에 매는 가방에 비해 척추에 대칭적으로 무게분산이 가능하지만, 무게중심이 뒤쪽으로 이동하게 하여, 체간이 전방굴곡되는 자세 변형을 야기한다. 본 연구는 모멘트팔의 길이차이에 따른 가방 착용 시 균형과 보행에 미치는 영향에 대해 확인하였다. 정형외과적 손상 및 신경학적 손상이 없는 정상 성인 30명을 대상으로 하였다. 대상자는 1) 백팩 미 착용, 2) 일반적인 백팩, 3) 모멘트 길이를 감소시킨 백팩의 3가지 조건에서 각각 균형 및 보행을 측정하였다. 자세동요면적과 속도에서 백팩 미착용과, 일반적인 백팩, 특수 백팩의 3가지 조건에 따른 유의한 차이가 있었으나, 백팩의 모멘트팔의 길이에 따른 유의한 차이는 없었다. 양하지 지지기와 보행속도는 백팩 미착용과, 일반적인 백팩, 특수 백팩의 3가지 조건에서 유의한 차이가 있었으며, 양하지 지지기에서만 백팩의 모멘트팔의 길이에 따른 유의한 차이가 있었다. 본 연구의 결과를 통해 백팩 착용시 모멘트팔의 길이 변화가 보행에 도움이 될 수 있었다.

Abstract ▼ AI-Helper

The present study investigated the effects of the moment arm length on balance and walking when carrying a backpack. In total, 30 normal adults without orthopedic and neurological injuries were assessed. For each subject, balance and gait were measured under three conditions: 1) the no backpack condition, 2) the general backpack condition, and 3) the decreased length of moment arm backpack condition. There were significant differences in the center of the pressure area and velocity between the three conditions, whereas there was no significant difference in the center of the pressure area and velocity according to the moment arm length. There were significant differences in double limb support time and walking velocity under the three conditions, and there was a significant difference only in double limb support time according to the moment arm length. The results of the present study showed that a change in the length of the moment arm can be helpful for walking when carrying a backpack.

주제어

표/그림 (3)

표 Table 1. General characteristics of the subjects (N=30)
표 Table 2. Differences in static balance according to backpack carriage and type (N=30)
표 Table 3. Differences in walking parameters according to backpack carriage and type (N=30)

AI 본문요약
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제안 방법

We specially designed a backpack to decrease the length of moment arm. Therefore, the present study aimed to investigate the effects of the length of moment arm of backpacks on postural sway and walking by using the designed backpack.

대상 데이터

The subjects of the present study were 30 adults (15 males and 15 females) aged 19 years or older.

데이터처리

0 for Windows statistics software (IBM, NY, USA). One-way repeated ANOVA was used to determine the differences in sway path, sway velocity, sway area, and spatiotemporal walking parameters for both feet under all three conditions. Post-hoc analysis was performed using the least significant difference (LSD).

성능/효과

The present study conducted an analysis on balance and walking when carrying a special backpack designed to decrease the length of the moment arm. The results indicated that there was no significant difference in static balance when carrying the special backpack compared to a traditional backpack, but double limb support time was improved.
The results of comparing the difference in postural sway according to the presence or absence of backpack carriage and backpack type showed that there was no statistically significant difference in postural sway path between the three conditions, and that sway velocity and area were significantly increased under the two conditions of backpack carriage compared to no backpack carriage (p<.05), but there was no difference according to backpack type(Table 2).
The results of the present study indicated that there was a significant difference in sway velocity and sway area according to the presence or absence of the backpack, whereas there was no significant difference according to the backpack type. The results of a study comparing static balance according to the position of a bag found that static balance was improved when carrying a front pack[17].
The results of the present study showed that during walking, there was a significant difference in the double limb support and walking velocity according to backpack carriage, and double support limb time significantly improved when carrying the special backpack designed to decrease the length of the moment arm compared to general backpacks. In addition, walking velocity was found to increase when carrying the special backpack compared to general backpacks, but it was not statistically significant.

후속연구

Future studies are needed to investigate the effects of backpack carriage and backpack type on balance, walking, and postural changes under various conditions of backpack weight and length of moment arm.

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